My Crazy Idea to Get Big Sister Back

So I've been having this wild idea lately that's making me feel all giggly inside. You know how big sister always teases me and calls me 'Fluffy'? Well, I thought why not give it right back to her but in a funny way? Last night, I was looking through old photo albums (yes, we still have those) when I found this one where she's wearing this really silly hat that made her look like a clown. So I got the idea: what if I put up a flyer around school with her picture on it and underneath write 'Looking for this clown? She stole my lunch box!' But then I thought, would that be too mean? It might make her laugh though... or maybe get us into trouble. Haha! What do you think? Should I go through with the plan or not?